We don't have synonyms for hijaz yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are hijab, hejaz and hija.
(n) :
A mountainous geographic area in northwest Saudi Arabia which gave rise to early Islam and which contains the sites of many holy places
(n) :
(historical) A former kingdom in modern Saudi Arabia, existing between 1924 and 1932, when it merged with Najd to form the present state of Saudi Arabia
(n) :
A mountainous geographic area in northwest Saudi Arabia which gave rise to early Islam and which contains the sites of many holy places
(n) :
(historical) A former kingdom in modern Saudi Arabia, existing between 1924 and 1932, when it merged with Najd to form the present state of Saudi Arabia